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Extra info for 640-801 Cisco CCNA Cisco Certified Network Associate (Version 90.0)
Which of one of the subnet masks below is capable of providing one useful subnet for each of the above departments (support, financial, sales & development) while still allowing enough usable host addresses to meet the needs of each department? This also leaves us with 5 bits for hosts, which gives us 30 hosts. Only 1 bit is required to give us 128 but 1 bit gives us 0 subnets. This is too few. Two of the networks require more than 14 hosts so this will not do. All the networks require more than 6 hosts so this will not do.
This is an illegal subnet mask for a class C network, as the third octet can not be divided when using a class C network. It provides for one network, with 254 usable host IP addresses. This does not meet the requirement of a minimum of 18 hosts. How many usable subnets and host addresses per subnet were created as a result of this? Using the 2n-2 formula (24-2 in this case) we have 14 host addresses and 14 network addresses. Remember we need to always subtract two for the network and broadcast addresses, so this answer is incorrect.
There are 50 usable subnets. There are 254 usable hosts per subnet. There are 24 usable hosts per subnet. There is one usable network. The 2n - 2 formula (28 - 2 in this case for both the network and IP hosts) gives us 254 networks and 254 hosts per network. We must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256. No possible network mask would give us this exact number of subnets or hosts. This would be true if this were a class C network, not a class B.